UPSC Physics Atomic Physics Question Bank

done Modern physics and Sources of energy Total Questions - 40

• question_answer1)
  Chadwick was awarded the 1935 Nobel prize in physics for his discovery of the
  A)
  electron done clear
  B)
                            proton done clear
  C)
  neutron done clear
  D)
         positron done clear
  View Solution play_arrow

• question_answer2)
        The process of superimposing signal frequency (i.e., audio wave) on the carrier wave is known as
  A)
  Transmission           done clear
  B)
         Reception done clear
  C)
  Modulation done clear
  D)
         Detection done clear
  View Solution play_arrow

• question_answer3)
        Electromagnetic radiations are emitted by which of the following?                        [NDA]
  A)
  Only by radio and television transmitting antennas done clear
  B)
  Only by bodies at temperature higher than their surroundings done clear
  C)
  Only by red-hot bodies done clear
  D)
  By all bodies done clear
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• question_answer4)
        If an a-particle is projected normally through a uniform magnetic field, then the path of the a-particle inside the field will be                    [NDA]
  A)
  circular                   done clear
  B)
         parabolic done clear
  C)
  elliptical                 done clear
  D)
         a straight line done clear
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• question_answer5)
       

  Which one of the following is correct?                           [NDA]

  The wavelength of the X-rays

                           
  A)
  is longer than the wavelength of sound waves done clear
  B)
  is longer than the wavelength of the yellow sodium light done clear
  C)
  is longer than the wavelength of radio waves done clear
  D)
  is of the order of 0.1 nanometer done clear
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• question_answer6)
        Light Emitting Diode (LED) converts                          [CDS]
  A)
  light energy into electrical energy done clear
  B)
  electrical energy into light energy done clear
  C)
  thermal energy into light energy done clear
  D)
  mechanical energy into electrical energy done clear
  View Solution play_arrow

• question_answer7)
        Television signal cannot be received generally beyond a particular distance due to                    [CDS]
  A)
  curvature of the Earth done clear
  B)
  weakness of antenna done clear
  C)
  weakness of signal done clear
  D)
  absorption of signal in air done clear
  View Solution play_arrow

• question_answer8)
  Sun emits energy in the form of electromagnetic radiation. The following help in the generation of solar energy. Arrange them in the right sequence beginning from the starting of the cycle: [NDA]

  1. Hydrogen is converted to helium at very high temperatures and pressures.

  2. The energy finds its way to sun's surface.

  3. A vast quantity of energy is generated by nuclear fusion.

  Select the correct answer using the code given below.
  A)
  1-2-3                     done clear
  B)
  2-3-1 done clear
  C)
  3-2-1                     done clear
  D)
  1-3-2 done clear
  View Solution play_arrow

• question_answer9)
       

  Consider the following statements:                   [IAS Prelim]

  At the present level of technology available in India, solar energy can be conveniently used to:

  1. Supply hot water to residential buildings.

  2. Supply water for minor irrigation projects.

  3. Provide street lighting.

  4. Electrify a cluster of villages and small towns.

  A)
  1, 2, 3 and 4 are correct done clear
  B)
  2 and 4 are correct done clear
  C)
  1 and 3 are correct done clear
  D)
  1, 2 and 3 are correct done clear
  View Solution play_arrow

• question_answer10)
        The neutron, proton, electron and alpha particle are moving with equal kinetic energies. How can the particles be arranged in the increasing order of their velocities?                        [NDA]
  A)
  alpha particle-neutron-proton- electron done clear
  B)
  proton-electron-neutron-alpha particle done clear
  C)
  electron-proton-neutron-alpha particle done clear
  D)
  neutron-proton-electron-alpha particle done clear
  View Solution play_arrow

• question_answer11)
  Match the Column I and Column II.

  	Column -1		Column - II
  [A]	Isotopes	(1)	Mass number same but different atomic number
  [B]	Isobars	(2)	Atomic number same but different mass number.
  [C]	Isotones	(3)	Number of neutrons plus number of protons
  [D]	Nucleons	(4)	Number of neutrons same but different atomic number

   
  A)
  [A] \[\to \] (3);   [B] \[\to \] (1);   [C] \[\to \] (2);   [D] \[\to \] (4) done clear
  B)
  [A] \[\to \] (2);   [B] \[\to \] (1);   [C] \[\to \] (4);   [D] \[\to \] (3) done clear
  C)
  [A] \[\to \] (1);   [B] \[\to \] (2);   [C] \[\to \] (3);   [D] \[\to \] (4) done clear
  D)
  [A] \[\to \] (1);   [B] \[\to \] (3);   [C] \[\to \] (2);   [D] \[\to \] (4) done clear
  View Solution play_arrow

• question_answer12)
        Select the correct statement(s) from the following.

  I. In conductors, the valence and conduction bands may overlap.

  II. Substances with energy gap of the order of 10 eV are insulators.

  III. The resistivity of a semiconductor increases with increase in temperature.

  IV. The conductivity of a semiconductor increases with increase in temperature.

  A)
  I and II only           done clear
  B)
         I and III only done clear
  C)
  I, II and IV done clear
  D)
         I, II, III and IV done clear
  View Solution play_arrow

• question_answer13)
        Which of the following cannot be fabricated on an IC?                    [CDS]
  A)
  Transistors done clear
  B)
  Inductors and transformers done clear
  C)
  Diodes done clear
  D)
  Resistors done clear
  View Solution play_arrow

• question_answer14)
        At absolute zero, Si acts as
  A)
  non-metal               done clear
  B)
         metal done clear
  C)
  insulator       done clear
  D)
         None of these done clear
  View Solution play_arrow

• question_answer15)
        Telephony is an example of _____ mode of communication
  A)
  point-to-point          done clear
  B)
         broad cast done clear
  C)
  both [a] and [b]       done clear
  D)
         None of these done clear
  View Solution play_arrow

• question_answer16)
       

  	Column-I		Column-II
  [A]	Hydrogen bomb	(1)	Fission
  [B]	Atom bomb	(2)	Fusion
  [C]	Binding energy	(3)	Critical mass
  [D]	Nuclear reactor	(4)	Mass defect

   
  A)
  [A] \[\to \] (3);   [B] \[\to \] (2);   [C] \[\to \] (1);   [D] \[\to \] (4) done clear
  B)
  [A] \[\to \] (2);   [B] \[\to \] (1);   [C] \[\to \] (4);   [D] \[\to \] (3) done clear
  C)
  [A] \[\to \] (3);   [B] \[\to \] (1);   [C] \[\to \] (2);   [D] \[\to \] (4) done clear
  D)
  [A] \[\to \] (4);   [B] \[\to \] (2);   [C] \[\to \] (3);   [D] \[\to \] (1) done clear
  View Solution play_arrow

• question_answer17)
        Which of the following statements is/are correct?

  I. Pure Si doped with trivalent impurities gives a p-type semiconductor

  II. Majority carriers in a n-type semiconductor are holes

  III. Minority carriers in a p-type semiconductor are electrons

  IV. The resistance of intrinsic semiconductor decreases with increase of temperature

  A)
  I only                     done clear
  B)
         I, III and IV done clear
  C)
  I and IV                 done clear
  D)
         II only done clear
  View Solution play_arrow

• question_answer18)
        The active component in an IC are
  A)
  Resistors done clear
  B)
  Capacitors done clear
  C)
  Transistors and diodes done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer19)
        The waves used in telecommunication are                            [SSC]
  A)
  IR                done clear
  B)
         UV done clear
  C)
  Microwave done clear
  D)
         Cosmic rays done clear
  View Solution play_arrow

• question_answer20)
        Audio signal cannot be transmitted because
  A)
  the signal has more noise done clear
  B)
  the signal cannot be amplified for distance communication done clear
  C)
  the transmitting antenna length is very small to design done clear
  D)
  the transmitting antenna length is very large and impracticable done clear
  View Solution play_arrow

• question_answer21)
        Television signals are
  A)
  frequency modulated done clear
  B)
  amplitude modulated done clear
  C)
  both frequency and amplitude modulated done clear
  D)
  phase modulated done clear
  View Solution play_arrow

• question_answer22)
        Repeaters used in telephone links are:                         [NDA]
  A)
  Rectifiers                done clear
  B)
         Oscillators done clear
  C)
  Amplifiers  done clear
  D)
         Transformers done clear
  View Solution play_arrow

• question_answer23)
        The transistor are usually made of                   [CDS]
  A)
  metal oxides with high temperature coefficient of resistivity done clear
  B)
  metals with high temperature coefficient of resistivity done clear
  C)
  metals with low temperature coefficient of resistivity done clear
  D)
  semiconducting materials having low temperature coefficient of resistivity done clear
  View Solution play_arrow

• question_answer24)
        A moderator is used in nuclear reactors in order to
  A)
  slow down the speed of the neutrons done clear
  B)
  accelerate the neutrons done clear
  C)
  increase the number of neutrons done clear
  D)
  decrease the number of neutrons done clear
  View Solution play_arrow

• question_answer25)
        The main constituent of biogas is
  A)
  methane    done clear
  B)
         carbon dioxide done clear
  C)
  hydrogen                         done clear
  D)
  hydrogen sulphide done clear
  View Solution play_arrow

• question_answer26)
        _____ is used as a fuel in space ships.
  A)
  Hydrogen  done clear
  B)
         Alcohol done clear
  C)
  Petrol                     done clear
  D)
         Diesel done clear
  View Solution play_arrow

• question_answer27)
  Propane is used instead of natural gas on many farms and in rural areas. Why is propane often used instead of natural gas?
  A)
  It's safer                 done clear
  B)
  It's portable done clear
  C)
  It's cleaner              done clear
  D)
  It's cheaper done clear
  View Solution play_arrow

• question_answer28)
        Which one of the following is the correct sequence of the wavelengths of radiations?                           [NDA]
  A)
  UV > Green> IR > Hard X-rays done clear
  B)
  IR > Green> UV > Hard X-rays done clear
  C)
  UV > Hard X-rays> IR > Green done clear
  D)
  IR > Hard X-rays> Green> UV done clear
  View Solution play_arrow

• question_answer29)
        The most familiar form of radiant energy in sunlight that causes tanning and sun burning of human skin, is called                         [CDS]
  A)
  ultraviolet radiation                        done clear
  B)
  visible radiation done clear
  C)
  infrared radiation done clear
  D)
  microwave radiation done clear
  View Solution play_arrow

• question_answer30)
        Which one among the following radiations carries maximum energy?                   [NDA]
  A)
  Ultraviolet rays        done clear
  B)
         Gamma-rays done clear
  C)
  X-rays                    done clear
  D)
         Infra-red rays done clear
  View Solution play_arrow

• question_answer31)
        In a hydro power plant
  A)
  potential energy possessed by stored water is converted into electricity done clear
  B)
  kinetic energy possessed by stored water is converted into potential energy done clear
  C)
  electricity is extracted from water done clear
  D)
  water is converted into steam to produce electricity done clear
  View Solution play_arrow

• question_answer32)
        Which part of the solar cooker is responsible for greenhouse effect?
  A)
  Coating with black colour inside the box done clear
  B)
  Mirror done clear
  C)
  Glass sheet done clear
  D)
  Outer cover of the solar cooker done clear
  View Solution play_arrow

• question_answer33)
        A perfect black body has the unique characteristic feature as                     [CDS]
  A)
  a good absorber only done clear
  B)
  a good radiator only done clear
  C)
  a good absorber and a good radiator done clear
  D)
  neither a radiator nor an absorber done clear
  View Solution play_arrow

• question_answer34)
  The phenomenon of high and low tides and the difference in sea levels give­­­­­­­­­­­­­­­­­­­­­­­ __________.
  A)
  Hydel energy          done clear
  B)
  Tidal energy done clear
  C)
  Wave energy           done clear
  D)
  Thermal energy done clear
  View Solution play_arrow

• question_answer35)
        Which of the following does NOT allow harmful ultraviolet radiations from the sun to reach the earth?
  A)
  \[{{O}_{2}}\]                  done clear
  B)
         \[N{{O}_{2}}\] done clear
  C)
  \[C{{O}_{2}}\]               done clear
  D)
         \[{{O}_{3}}\] done clear
  View Solution play_arrow

• question_answer36)
        Solar cells generate little amount of electricity, but are becoming popular because
  A)
  its raw material Silicon is available in large quantities in India done clear
  B)
  it can be set up in remote and inaccessible hamlets without laying transmission lines done clear
  C)
  electricity generated from solar cells can be stored and used when required done clear
  D)
  All of these done clear
  View Solution play_arrow

• question_answer37)
        Geothermal energy is
  A)
  energy of magma inside the earth crust done clear
  B)
  energy stored as heat in the earth done clear
  C)
  amount of energy obtained from coal and petroleum inside earth crust. done clear
  D)
  amount of minerals obtained from earth crust done clear
  View Solution play_arrow

• question_answer38)
        Tidal energy is a
  A)
  form of energy obtained from kinetic energy of moving ocean water done clear
  B)
  form of energy which is obtained from the river in the form of tidal waves done clear
  C)
  form of energy which is obtained from the lake in the form of tidal waves done clear
  D)
  form of energy which is obtained from the ocean in the form of tidal waves. done clear
  View Solution play_arrow

• question_answer39)
        Which among the following statements are the requirements of good source of energy?

  A. It should do a large amount of work per unit volume or mass.

  B. It should be easily accessible.

  C. It should be easy to store and transport.

  D. It should be economical.

                      
  A)
  A, B             done clear
  B)
         A, B, C                done clear
  C)
  B, C, D                  done clear
  D)
         All of these generator.    done clear
  View Solution play_arrow

• question_answer40)
        Which of the following statement is/are the applications of photovoltaic cells?                             

  A. They are used to detect opacity of solids, defects materials.

  B. They are used to switch on and off the street automatically

  C. They are used to compare illuminating power of two sources.

  D. To control temperature in furnaces and chemical reactions

  A)
  B and C                 done clear
  B)
         B, C, D done clear
  C)
  A, B, C                  done clear
  D)
         All of these done clear
  View Solution play_arrow